How to grow Rock cress 'Whitewell Gem'
Keep in mind when planting that Whitewell Gem is thought of as hardy, so this plant will survive close to or on freezing temperatures.
Growing Whitewell Gem from seed
Soil temperature should be kept higher than 10°C / 50°F to ensure good germination.
Transplanting Whitewell Gem
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Whitewell Gem is a hardy plant.
Harvesting Whitewell Gem